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copy_file_range for def_blk_ops for direct block device Date: Mon, 5 Jun 2023 17:47:20 +0530 Message-Id: <20230605121732.28468-5-nj.shetty@samsung.com> X-Mailer: git-send-email 2.35.1.500.gb896f729e2 In-Reply-To: <20230605121732.28468-1-nj.shetty@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA01TazBcZxjud846dmOY4xL5rFy221GDuKygnyBMaswZ2ozEn1TT6rLHpdjd 7K5KKm13o2EisSSadLqUxErdWluXGtdWVhC3iiIZWkGsGNnUdTJ0RNRa2vx73ud9n+e9fPMx casqUzYzQSijJUJ+EpfYw6hvd3J09Rj5QuAxo3dEmp5OHF3M3cBR5XgOgfTtywDdXPwHR7q2 TICGdBZo8rdA1Dqfb4JG2xox1FJ8HUPllR0Yar69hKHr2ocAzYyoMNQ65oJuZ5QwUEtrNwMN NRUQqOiHGVN05VEDgUq7XmFIm5eOoQadAqD69SIcVekXGOj+mD0a2OgyQetrBUTQAWpoOIxS TfQTVKNq3JQaeFzNoGrLnKmh/hSqpuIyQdWWfEU1j8oJSq3MM6Gy0+cJamlmjEEt/DpCUMq6 CkDV9qZRKzUHwy0jE/3jab6AlnBoYYxIkCCMC+CGRUS9G+Xt48Fz5fmid7gcIT+ZDuAGvxfu GpKQtHUiLuczflLKFhXOl0q57sf8JaIUGc2JF0llAVxaLEgSe4ndpPxkaYowzk1Iy47yPDw8 vbcKP0mMz9bcwcWvHM5Va0oJORg9lAVYTEh6QeWDGiIL7GFakc0A3nk2yzAGywA+v6E2MQYr 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2QXNlaVimpbgpl103iYlatk0Z7YsM1u3peW6WbpCoja7WqbWHEH/Pfx+z/v89VI47w0xk4pL 2MPKE0RSPulMNN7ke8/PNR0WL/h4dTKqvXsbR+l5oziqeZlLog83PwNUaPuJo4G24wCZBlxR 3/UVSP9JzUG9bU0YainNx1B1zS0MXbswhKF8Qw9Alm4VhvTmeehChoZALfpOApmai0l0rsLC RdlPdSSq7BjDkKFAiSHdwBGAGkfO4ejSByuB7pg90IPRDg4aGS4mV3oxpifhjOq1kWSaVC+5 zINXdQTTUOXPmIzJTL02k2QaNKnMtd40kik7WcBhcpSfSGbIYiYYa2s3yZy8rAVMQ9dB5kv9 rI1uW5yFYlYat5eVBy6PcY7NqS3HZWM+++tqK8k00OudBZwoSC+GfRkXOVnAmeLROgDLuzq4 DuEOK0bbcUeeAqvH3nMdJSUG085YsSxAUSQ9D3aNU3Y+lb6MQ+OvAo79AKef47DI6GnPU+it sDBfOcEJ2gdqhssmsgsdDNvN2Vz7DqQDYe5rNzt2okPgoNGA2zHvb6XbKnS03WBn0QDhWPeG yitqPA/Qqv+U6j91HmBa4M7KFPGSeMVCmSCB3RegEMUrkhMkATsS4+vBxBf4++tAi9YWYAAY BQwAUjh/qkvz2oNinotYlHKAlSdulydLWYUBeFAEf4bLw6zO7TxaItrD7mZZGSv/ZzHKaWYa Ftl/1/uGdH2w8NQbT7NuUVDMlaMRukZJ+9hqkLohpOwhPsgpzMuWC1tiXqzhnJ62Ifrez225 O0w9KX2U+JCgu0cT8EiwJmewaqdNWLFkWP3tV2ytxJLU2vquuOGspu7U7nF3imd1C2t+rzuu r7y1NrD3u8+SE5lRcdPFNX3pJavMR8fv19m8jCfa3s2OijbYHheJ1EOaj0GZSaEjzVJ1yNy5 P/iTEzfLuMcEtz301zdFWHxb5Y9dO7g1kybNkYY1gYr+4HE/vwMZHqVeg56l/Snpm79UBQX2 JEt+L4h8ti/sa7jWN3Ra+a63XkvXLS86Q0WOLktNCnUNni4W8JW+ESX5fEIRK1roj8sVoj92 6+OjdAMAAA== X-CMS-MailID: 20230605122239epcas5p236a716d16fa1d1a2dfff856158deb5af X-Msg-Generator: CA X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20230605122239epcas5p236a716d16fa1d1a2dfff856158deb5af References: <20230605121732.28468-1-nj.shetty@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org For direct block device opened with O_DIRECT, use copy_file_range to issue device copy offload, and fallback to generic_copy_file_range incase device copy offload capability is absent. Modify checks to allow bdevs to use copy_file_range. Suggested-by: Ming Lei Signed-off-by: Anuj Gupta Signed-off-by: Nitesh Shetty --- block/blk-lib.c | 26 ++++++++++++++++++++++++++ block/fops.c | 20 ++++++++++++++++++++ fs/read_write.c | 7 +++++-- include/linux/blkdev.h | 4 ++++ 4 files changed, 55 insertions(+), 2 deletions(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index 99b65af8bfc1..31cfd5026367 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -534,6 +534,32 @@ ssize_t blkdev_copy_offload( } EXPORT_SYMBOL_GPL(blkdev_copy_offload); +/* Copy source offset from source block device to destination block + * device. Returns the length of bytes copied. + */ +ssize_t blkdev_copy_offload_failfast( + struct block_device *bdev_in, loff_t pos_in, + struct block_device *bdev_out, loff_t pos_out, + size_t len, gfp_t gfp_mask) +{ + struct request_queue *in_q = bdev_get_queue(bdev_in); + struct request_queue *out_q = bdev_get_queue(bdev_out); + ssize_t ret = 0; + + if (blkdev_copy_sanity_check(bdev_in, pos_in, bdev_out, pos_out, len)) + return 0; + + if (blk_queue_copy(in_q) && blk_queue_copy(out_q)) { + ret = __blkdev_copy_offload(bdev_in, pos_in, bdev_out, pos_out, + len, NULL, NULL, gfp_mask); + if (ret < 0) + return 0; + } + + return ret; +} +EXPORT_SYMBOL_GPL(blkdev_copy_offload_failfast); + static int __blkdev_issue_write_zeroes(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, unsigned flags) diff --git a/block/fops.c b/block/fops.c index f56811a925a0..9189f3239c9c 100644 --- a/block/fops.c +++ b/block/fops.c @@ -599,6 +599,25 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) return ret; } +static ssize_t blkdev_copy_file_range(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + size_t len, unsigned int flags) +{ + struct block_device *in_bdev = I_BDEV(bdev_file_inode(file_in)); + struct block_device *out_bdev = I_BDEV(bdev_file_inode(file_out)); + ssize_t comp_len = 0; + + if ((file_in->f_iocb_flags & IOCB_DIRECT) && + (file_out->f_iocb_flags & IOCB_DIRECT)) + comp_len = blkdev_copy_offload_failfast(in_bdev, pos_in, + out_bdev, pos_out, len, GFP_KERNEL); + if (comp_len != len) + comp_len = generic_copy_file_range(file_in, pos_in + comp_len, + file_out, pos_out + comp_len, len - comp_len, flags); + + return comp_len; +} + #define BLKDEV_FALLOC_FL_SUPPORTED \ (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \ FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE) @@ -692,6 +711,7 @@ const struct file_operations def_blk_fops = { .splice_read = filemap_splice_read, .splice_write = iter_file_splice_write, .fallocate = blkdev_fallocate, + .copy_file_range = blkdev_copy_file_range, }; static __init int blkdev_init(void) diff --git a/fs/read_write.c b/fs/read_write.c index b07de77ef126..d27148a2543f 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1447,7 +1447,8 @@ static int generic_copy_file_checks(struct file *file_in, loff_t pos_in, return -EOVERFLOW; /* Shorten the copy to EOF */ - size_in = i_size_read(inode_in); + size_in = i_size_read(file_in->f_mapping->host); + if (pos_in >= size_in) count = 0; else @@ -1708,7 +1709,9 @@ int generic_file_rw_checks(struct file *file_in, struct file *file_out) /* Don't copy dirs, pipes, sockets... */ if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) return -EISDIR; - if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) + + if ((!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) && + (!S_ISBLK(inode_in->i_mode) || !S_ISBLK(inode_out->i_mode))) return -EINVAL; if (!(file_in->f_mode & FMODE_READ) || diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 69fe977afdc9..a634768a2318 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1057,6 +1057,10 @@ ssize_t blkdev_copy_offload( struct block_device *bdev_in, loff_t pos_in, struct block_device *bdev_out, loff_t pos_out, size_t len, cio_iodone_t end_io, void *private, gfp_t gfp_mask); +ssize_t blkdev_copy_offload_failfast( + struct block_device *bdev_in, loff_t pos_in, + struct block_device *bdev_out, loff_t pos_out, + size_t len, gfp_t gfp_mask); struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, gfp_t gfp_mask); void bio_map_kern_endio(struct bio *bio);